Cisco Prime Access Registrar 7.0 Installation and Configuration Guide

General Command Syntax

Prime Access Registrar stores its configuration information in a hierarchy. Using the aregcmd command cd (change directory), you can move through this information in the same manner as you would through a hierarchical file system. You can also supply full path names to these commands to affect another part of the hierarchy, and thus avoid explicitly using the cd command to change to that part of the tree.

The aregcmd commands are case insensitive , which means that you can use upper or lowercase letters to designate elements. In addition, when you reference existing elements in the configuration, you only need to specify enough of the element’s name to distinguish it from the other elements at that level. For example, instead of entering cd Administrators , you can enter cd ad if no other element at the current level begins with ad .

You can use Prime Access Registrar’s command completion feature to see what commands are possible from your current directory location in the Prime Access Registrar server hierarchy by pressing the Tab key. You can also press the Tab key after entering a command to see which objects you might want to manage.

The aregcmd commands are command-line order dependent; that is, the arguments are interpreted based on their position on the command line. To indicate an empty string as a place holder on the command line, use either two single quotes ('') or two double quotes (""). In addition, if you use any arguments that contain spaces, make sure to quote the arguments.

aregcmd Commands

The aregcmd commands can be grouped into the following categories:

• Navigation commands—navigates within the Prime Access Registrar hierarchy; commands include cd , ls , pwd , next , prev , filter , and find .
• Object commands—adds or deletes objects; commands include add and delete .
• Property commands—changes the value of properties; commands include set , unset , and insert .
• Server commands—manages the server; commands include save , validate , start , stop , reload , status , stats , dia-stats, and trace .
• Application commands—allows user access to the application; commands include login , logout, exit , quit , and help .
• Session management commands—queries the server about sessions, release active sessions, or count the number of sessions; commands include query-sessions , release-sessions, and count-sessions .

This chapter uses only a few of the above commands to configure the Prime Access Registrar RADIUS server. For more information about all the aregcmd commands, see “Chapter 2, Using the aregcmd Commands ,” in the Cisco Prime Access Registrar 7.0 User Guide .

Running aregcmd

aregcmd is the command-line interface program used to configure the Prime Access Registrar server. The aregcmd program is located in $INSTALL/bin .

Step 1 Run the aregcmd command:

aregcmd

Step 2 When asked for “Cluster,” press Enter.

Step 3 Enter your administrator name and password.

When you install Prime Access Registrar software, the installation process creates a default administrator called admin with the password aicuser.

Prime Access Registrar allows you to perform the following:

• Change the administrator’s password. See Changing the Administrator’s Password.
• Add additional administrators. See Creating Additional Administrators.

Changing the Administrator’s Password

The administrator ID admin and password aicuser are default settings for all releases of Prime Access Registrar software. For security purposes, you should change the password for admin at your earliest convenience.

To change the administrator’s password:

Step 1 Use the cd command to change to the Administrators level. Prime Access Registrar displays the contents of the Administrators object.

cd //localhost/Administrators

Step 2 Use the cd command to change to admin :

cd admin

Step 3 Use the set command to change the administrator’s password. You enter the password on the command line in readable form, however, Prime Access Registrar displays it as encrypted.

The following example changes the password to 345 . You are asked to reenter it for confirmation.

set Password 345

Optionally, use the set command to change the description of the admin administrator.

set Description local

Step 4 Use the ls command to display the changed admin.

ls

Creating Additional Administrators

Use the add command to add additional administrators.

Step 1 Use the cd command to change to the Administrators level:

cd /Administrators

Step 2 Use the add command and specify the name of the administrator, an optional description, and a password.

The following example adds the administrator jane , description testadmin , and password 123 :

add jane testadmin 123

Step 3 Use the ls command to display the properties of the new administrator:

ls

Configuring Prime Access Registrar Server Settings

The top level of the Prime Access Registrar RADIUS server is the RADIUS object itself. It specifies the name of the server and other parameters. In configuring this site, you only need to change a few of these properties.

Note For session managers, user groups, user lists, and profiles, the attributes defined must match the protocol of the incoming packet. For example, if the incoming packet is a Diameter packet, the attributes defined must be specific to Diameter or common to both RADIUS and Diameter. Similarly, if the incoming packet is a RADIUS packet, the attributes defined must be specific to RADIUS or common to both RADIUS and Diameter. Otherwise, the incoming packet will not be processed.

This topic contains the following sections:

• Checking the System-Level Defaults
• Checking the Server’s Health
• Selecting Ports to Use

Checking the System-Level Defaults

Because this site does not use incoming or outgoing scripts, you do not need to change the scripts’ properties (IncomingScript and OutgoingScript).

Since the default authentication and authorization properties specify a single user list, you can leave these unchanged as well (DefaultAuthenticationService and DefaultAuthorizationService). And because you have decided to use a file for accounting information, you can leave this property unchanged (DefaultAccountingService).

Session management, however, is on by default (DefaultSessionManager). If you do not want to use session management, you must disable it. Use the set command, enter DefaultSessionManager , then specify an empty string by entering a set of double quotes:

set DefaultSessionManager ""

Note When you do not want Prime Access Registrar to monitor resources for user sessions, you should disable session management because using it affects your server performance.

You have now configured some of the properties for the RADIUS server. The next step is to add users.

Checking the Server’s Health

To check the server’s health, use the aregcmd command status . The following issues decrement the server’s health:

• Rejection of an Access-Request

Note One of the parameters in the calculation of the Prime Access Registrar server’s health is the percentage of responses to Access-Accepts that are rejections. In a healthy environment, the rejection percentage will be fairly low. An extremely high percentage of rejections could be an indication of a Denial of Service attack.

• Configuration errors
• Running out of memory
• Errors reading from the network
• Dropping packets that cannot be read (because the server ran out of memory)
• Errors writing to the network.

Prime Access Registrar logs all of these conditions. Sending a successful response to any packet increments the server’s health.

Selecting Ports to Use

By default, Prime Access Registrar uses well-known Linux ports 1812 and 1813 for TCP/IP communications. Prime Access Registrar can be configured to use other ports, if necessary. You can add them to the list of ports to use.

To configure Prime Access Registrar to use ports other than the default ports, complete the following steps:

Step 1 Change directory to /Radius/Advanced/Ports.

cd /Radius/Advanced/Ports

[ //localhost/Radius/Advanced/Ports ]

Step 2 Use the add command (twice) to add ports in pairs. (The ls is entered to show the results of the add command.)

add 1812

add 1813

ls

[ //localhost/Radius/Advanced/Ports ]

Entries 1 to 2 from 2 total entries
Current filter: <all>

1812/
1813/


Note After modifying Access Registrar’s default ports setting, to continue using the existing ports, you must add them to the list of ports in /Radius/Advanced/Ports.

Step 3 Enter the save and reload commands to affect, validate, and save your modifications to the Prime Access Registrar server configuration.

save

Validating //localhost...

Saving //localhost...

reload

Reloading Server 'Radius'...

Server 'Radius' is Running, its health is 10 out of 10


Displaying the UserLists

The first subobject in a RADIUS or Diameter hierarchy that you can configure is the Userlists. The UserLists object contains all of the individual UserLists, which in turn contain the specific users.

When Prime Access Registrar receives an Access-Request, it directs it to an authentication and/or authorization Service. If the Service has its type set to local , the Service looks up the user’s entry in the specific UserList , and authenticates and/or authorizes the user.

Prime Access Registrar, by default, specifies a Service called local-users that has the type local and uses the Default UserList (Figure 5-1).

Figure 5-1 Choosing Appropriate Services

This topic contains the following sections:

• Displaying the Default UserList
• Adding Users to UserLists
• Deleting Users

Displaying the Default UserList

Step 1 Use the cd command to change to UserLists/Default :

cd /Radius/Userlists/Default

Step 2 Use the ls -R command to display the properties of the three users:

ls -R

Prime Access Registrar displays the three sample users:

• bob who is configured as a PPP user
• jane who is configured as a Telnet user
• joe who is configured as either a PPP or Telnet user depending on how he logs in.

Adding Users to UserLists

Use the aregcmd command add to create a user under a UserList.

To add a user:

Step 1 Use the add command to specify the name of a user and an optional description on one command line.

add jane

Added jane


Step 2 Change directory to jane.

cd jane

[ //localhost/Radius/UserLists/Default/jane ]

Name = jane

Description =

Password = <encrypted>

Enabled = TRUE

Group~ = Telnet-users

BaseProfile~ =

AuthenticationScript~ =

AuthorizationScript~ =

UserDefined1 =

AllowNullPassword = FALSE

Attributes/

CheckItems/

Step 3 Use the set command to provide a password for user jane.

set password jane

Set Password <encrypted>


Note When using the aregcmd command, you can use the add command and specify all of the properties, or you can use the add command to create the object, and then use the set command and property name to set the property. For an example of using the set command, see the “Adding a NAS” section.

Deleting Users

To delete the sample users, or if you want to remove a user you have added, use the delete command.

From the appropriate UserList, use the delete command, and specify the name of the user you want to delete. For example, to delete user beth from the Default UserList, enter:

cd /Radius/UserLists/Default

delete beth

Displaying UserGroups

The UserGroups object contains the specific UserGroups. Specific UserGroups allow you to maintain common authentication and authorization attributes in one location, and then have users reference them. By having a central location for attributes, you can make modifications in one place instead of having to make individual changes throughout your user community.

Prime Access Registrar has three default UserGroups:

• Default —uses the script AuthorizeService to determine the type of service to provide the user.
• PPP-users— uses the BaseProfile default-PPP-users to specify the attributes of PPP service to provide the user. The BaseProfile default-PPP-users contains the attributes that are added to the response dictionary as part of the authorization. For more information about Profiles, see the “Configuring Profiles” section.
• Telnet-users— uses the BaseProfile default-Telnet-users to specify the attributes of Telnet service to provide the user. The BaseProfile default-Telnet-users contains the attributes that are added to the response dictionary as part of the authorization.

For this basic site, you do not need to change these UserGroups. You can, however, use the add or delete commands to add or delete groups.

Configuring Clients

The Clients object contains all NAS and proxies that communicate directly with Prime Access Registrar. Each client must have an entry in the Clients list, because each NAS and proxy share a secret with the RADIUS server, which is used to encrypt passwords and to sign responses. See Adding a NAS, for more information on adding a NAS in Prime Access Registrar.

Note If you are just testing Prime Access Registrar with the radclient command, the only client you need is localhost. The localhost client is available in the sample configuration. For more information about using the radclient command, see the “Using radclient” section.

Adding a NAS

You must add your specific NAS from both ends of the connection. That is, you must add Prime Access Registrar for your NAS, and you must add your NAS for Prime Access Registrar.

To add a NAS in Prime Access Registrar:

Step 1 Use the cd command to change to the Clients level:

cd /Radius/Clients

Step 2 Use the add command to add the NAS: QuickExampleNAS :

add QuickExampleNAS

Step 3 Use the cd command to change directory to the QuickExampleNAS directory:

cd /Radius/Clients/QuickExampleNAS

Step 4 Use the set command to specify the description WestOffice , the IP address 196.168.1.92 , the shared secret of xyz , and the Type as NAS .

set Description WestOffice

set IPAddress 209.165.200.225

set SharedSecret xyz

set Type NAS

set Vendor USR

set IncomingScript ParseServiceHints

EnableDynamicAuthorization TRUE

EnableNotifications TRUE

The script, ParseServiceHints , checks the username for %PPP or %SLIP . It uses these tags to modify the request so it appears to the RADIUS server that the NAS requested that service.

Note When you are using a different NAS than the one in the example, or when you are adding NAS proprietary attributes, see the Cisco Prime Access Registrar User Guide for more information about configuring Client and Vendor objects.

Configure your NAS, using your vendor’s documentation. Make sure both your NAS and the Client specification have the same shared secret.

Configuring Profiles

The Profiles object allows you to set specific RFC-defined attributes that Prime Access Registrar returns in the Access-Accept response. You can use profiles to group attributes that belong together, such as attributes that are appropriate for a particular class of PPP or Telnet user. You can reference profiles by name from either the UserGroup or the user properties. The sample users, mentioned earlier in this chapter, reference the following Prime Access Registrar profiles:

• default-PPP-users —specifies the appropriate attributes for PPP service
• default-SLIP-users —specifies the appropriate attributes for SLIP service
• default-Telnet-users — specifies the appropriate attributes for Telnet service.

This topic contains the following sections:

• Setting RADIUS / Diameter Attributes
• Adding Multiple Cisco AV Pairs

Setting RADIUS / Diameter Attributes

When you want to set an attribute to a profile, use the following command syntax:

set <attribute> <value>

This syntax assigns a new value to the named attribute. The following example sets the attribute Service-Type to Framed:

Step 1 Use the cd command to change to the appropriate profile and attribute.

cd /Radius/Profiles/Default-PPP-users/Attributes

Step 2 Use the set command to assign a value to the named attribute.

set Service-Type Framed

When you need to set an attribute to a value that includes a space, you must double-quote the value, as in the following:

set Framed-Routing "192.168.1.0/24 192.168.1.1"

Adding Multiple Cisco AV Pairs

When you want to add multiple values to the same attribute in a profile, use the following command syntax:

set <attribute> <value1> < value2> < value3>

The AV pairs cannot be added one at a time or each subsequent command will overwrite the previous value. For example, consider the following command entry:

set Cisco-AVpair "vpdn:12tp-tunnel-password=XYZ" "vpdn:tunnel-type=12tp" "vpdn:tunnel-id=telemar" "vpdn:ip-addresses=209.165.200.225"

ls

Note The example above is for explanation only; not all attributes and properties are listed.

Validating and Using Your Changes

After you have finished configuring your Prime Access Registrar server, you must save your changes. Saving your changes causes Prime Access Registrar to validate your changes and, if there were no errors, commit them to the configuration database.

Using the save command, however, does not automatically update your server. To update your server you must use the reload command. The reload command stops your server if it is running, and then restarts the server, which causes Prime Access Registrar to reread the configuration database.

You must save and reload your configuration changes in order for them to take effect in the Prime Access Registrar server. For more information, see Saving and Reloading.

Saving and Reloading

From anywhere in the radius object hierarchy, enter the save and reload commands.

Step 1 Use the save command to save your changes:

save

Step 2 Use the reload command to reload your server.

reload

Testing Your Configuration

Now that you have configured some users and a NAS, you are ready to test your configuration. There are two ways you can test your site:

1. You can act as a user and dial in to your NAS, and check that you can successfully log in.

2. You can run the radclient command, and specify one of the default users when making a request. For more information, see Using radclient.

Using radclient

You can use the radclient command simple to create and send a packet. The following example creates an Access-Request packet for user john with password john , and the packet identifier p001 . It displays the packet before sending it. It uses the send command to send the packet, which displays the response packet object identifier, p002 . Then, the example shows how to display the contents of the response packet.

Step 1 Run the radclient command.

. /radclient -s

Step 2 The radclient command prompts you for the administrator’s username and password (as defined in the Prime Access Registrar configuration). Use admin for the admin name, and aicuser for the password.

Step 3 Create a simple Access-Request packet for User-Name john and User-Password john . At the prompt, enter:

simple john john

The radclient command displays the ID of the packet p001 .

Step 4 Enter the packet identifier:

p001

Step 5 Send the request to the default host ( localhost ), enter:

p001 send

Step 6 Enter the response identifier to display the contents of the Access-Accept packet:

p002

Packet: code = Access-Accept, id = 1,\
length = 38, attributes =
Login-IP-Host = 196.168.1.94
Login-Service = Telnet
Login-TCP-Port = 541

Troubleshooting Your Configuration

If you are unable to receive an Access-Accept packet from the Prime Access Registrar server, you can use the aregcmd command trace to troubleshoot your problem.

The trace command allows you to set the trace level on your server, which governs how much information the server logs about the contents of each packet. You can set the trace levels from zero to four. The system default is zero, which means that no information is logged. For more information, see Setting the Trace Level.

Setting the Trace Level

Step 1 Run the aregcmd command.

aregcmd

Step 2 Use the trace command to set the trace level to 1-5.

trace 2

Step 3 Try dialing in again.

Step 4 Use the UNIX tail command to view the end of the name_radius_1_trace log.

host% tail -f /opt/CSCOar/logs/name_radius_1_trace

Step 5 Read through the log to see where the request failed.

Enabling SNMP in the Cisco Prime Access Registrar Server

To enable SNMP on the Prime Access Registrar server, launch aregcmd and set the /Radius/Advanced/SNMP/Enabled property to TRUE.

aregcmd

cd /Radius/Advanced/SNMP

set Enabled TRUE

Stopping the Master Agent

Stop the Prime Access Registrar SNMP master agent by stopping the Prime Access Registrar server.

/opt/CSCOar/bin/arserver stop

Modifying the snmpd.conf File

snmpd.conf file is placed in the /cisco-ar/ucd-snmp/share/snmp directory. Use vi (or another text editor) to edit the snmpd.conf file.

The three parts of this file to modify are:

• Access Control
• Trap Recipient
• System Contact Information

Access Control

Access control defines who can query the system. By default, the agent responds to the public community for read-only access, if run without any configuration file in place.

The following example from the default snmpd.conf file shows how to configure the agent so that you can change the community names, and give yourself write access as well.

To modify the snmpd.conf file:

Step 1 Look for the following lines in the snmpd.conf file for the location in the file to make modifications:

Step 2 First map the community name (COMMUNITY) into a security name that is relevant to your site, depending on where the request is coming from:

The names are tokens that you define arbitrarily.

Step 3 Map the security names into group names:

Step 4 Create a view to enable the groups to have rights:

Step 5 Finally, grant the two groups access to the one view with different write permissions:

Trap Recipient

The following example provides a sample configuration that sets up trap recipients for SNMP versions v1 and v2c.

Note Most sites use a single NMS, not two as shown below.

Note trapsink is used in SNMP version 1; trap2sink is used in SNMP version 2.

trapcommunity defines the default community string to be used when sending traps. This command must appear prior to trapsink or trap2sink which use this community string.

trapsink and trap2sink are defined as follows:

trapsink hostname community port

trap2sink hostname community port

System Contact Information

System contact information is provided in two variables through the snmpd.conf file, syslocation, and syscontact.

Look for the following lines in the snmpd.conf file:

Restarting the Master Agent

Restart the Prime Access Registrar SNMP master agent by restarting the Prime Access Registrar server.

/opt/CSCOar/bin/arserver restart

Testing Dynamic DNS with radclient

After the Resource Manager has been defined it must be referenced from the appropriate Session Manager. You can use radclient to confirm that dynamic DNS has been properly configured and is operational.

To test Dynamic DNS using radclient :

Step 1 Launch aregcmd and log into the Prime Access Registrar server.

cd /opt/CSCOar/bin

aregcmd

Step 2 Use the trace command to set the trace to level 4.

trace 4

Step 3 Launch radclient .

cd /opt/CSCOar/bin

radclient

Step 4 Create an Accounting-Start packet.

acct_request Start username

Example:

set p [ acct_request Start bob ]

Step 5 Add a Framed-IP-Address attribute to the Accounting-Start packet.

Step 6 Send the Accounting-Start packet.

$p send

Step 7 Check the aregcmd trace log and the DNS server to verify that the host entry was updated in both the forward and reverse zones.